#region The MIT License
// The MIT License
// 
// Copyright (c) 2009 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion
using System;
using System.ComponentModel.Composition;
using System.Diagnostics;

namespace octalforty.Componento.ComponentModel.Tracing
{
    [Export(typeof(ITraceManagerService))]
    public class TraceManagerService : ITraceManagerService, ITraceWriterRoot
    {
        #region Private Fields
        [ThreadStatic()]
        private static int logicalOperationOffest;

        private Func<DateTime> dateTimeProvider = () => DateTime.Now;
        #endregion

        #region Public Properties
        [ImportMany()]
        public Lazy<ITraceWriter>[] TraceWriters
        { get; set;  }

        public Func<DateTime> DateTimeProvider
        {
            get { return dateTimeProvider; }
            set { dateTimeProvider = value; }
        }

        #endregion

        public ITrace GetTrace(string source)
        {
            return new Trace(this, source);
        }

        public void BeginLogicalOperation()
        {
            logicalOperationOffest += 1;
        }

        public void EndLogicalOperation()
        {
            if(logicalOperationOffest > 0)
                logicalOperationOffest -= 1;
        }

        public void Write(TraceLevel level, string source, string message)
        {
            if(TraceWriters == null || TraceWriters.Length == 0)
                return;

            var dateTime = DateTimeProvider();
            foreach(var traceWriter in TraceWriters)
                traceWriter.Value.Write(dateTime, level, logicalOperationOffest, source, message);
        }
    }
}